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Which term breaks the rule in 3, 5, 9, 17, 34, 65, 129?

Competition practiceNumber Series

A34
B17
C65
D9

Step-by-Step Solution

Rule: × 2 − 1.

17 \times 2 - 1 = 33

, not 34;

33 \times 2 - 1 = 65

and

65 \times 2 - 1 = 129

confirm it.

Answer: A) 34

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